I made the same thing with a friend, first he used tables, but now he understands that tables should be used only to display tabular data...
I think you should show him a stylesheet of any site, why look for templates ? You can have mine,
http://joaopj.789mb.com/j/styles.php maybe you won't understand the class and id names, but it's CSS valid and simple... You should tell your cousin to visit
W3Schools Online Web Tutorials .... they have a lot of nice things, and really, the best things in life are free
